The Gravity Assist Podcast is hosted by NASA's Director of Planetary Science, Jim Green, who each week talks to some of the greatest planetary scientists on the planet, giving a guided tour through ...

In our solar system, the two outermost planets of Uranus and Neptune are something of an oddity. Although both planets are of a similar mass and are similarly distant from the sun, the two are ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

You probably already know that gravity can greatly influence cosmic objects as they make their way through space. We see this constantly in how the Sun's gravity causes planets to orbit it. And even ...

Paul M. Sutter is an astrophysicist at SUNY Stony Brook and the Flatiron Institute, host of Ask a Spaceman and Space Radio, and author of How to Die in Space. He contributed this article to ...

Astronomers obsessed with solving the mysteries of dark matter or dark energy should remember: To make a great discovery, sometimes you need to know what you’re looking for. Take Michel Lalande. He ...

Astronomers have long speculated about the existence of a mysterious planet lurking far beyond Neptune, a world several times larger than Earth whose gravity could be shaping the outer reaches of our ...

It was exactly one year ago this week that astronomers found a brand-new planet in our solar system — a giant ball of ice and gas some 17 times the mass of Earth, orbiting the sun beyond Uranus.

Because the solar system's contents formed from a disk around the sun, we would expect the orbits of everything orbiting the sun to keep relatively close to the plane of that disk. However, some don’t ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. From where we are in the Solar System, looking out at the distant ...

• Neptune had 13 known moons, including six small ones discovered by Voyager 2 in 1989. • Scientists were studying old Hubble Telescope pictures of the planet's moon and rings when they discovered a ...